/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

/*
 *  RFC 1186/1320 compliant MD4 implementation
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
/*
 *  The MD4 algorithm was designed by Ron Rivest in 1990.
 *
 *  http://www.ietf.org/rfc/rfc1186.txt
 *  http://www.ietf.org/rfc/rfc1320.txt
 */

#include "tls/config.h"

#if defined(MBEDTLS_MD4_C)

#include "tls/md4.h"

#include <string.h>

#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "tls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif							/* MBEDTLS_PLATFORM_C */
#endif							/* MBEDTLS_SELF_TEST */

#if !defined(MBEDTLS_MD4_ALT)

/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize(void *v, size_t n)
{
	volatile unsigned char *p = v;
	while (n--) {
		*p++ = 0;
	}
}

/*
 * 32-bit integer manipulation macros (little endian)
 */
#ifndef GET_UINT32_LE
#define GET_UINT32_LE(n, b, i)                            \
{                                                       \
(n) = ((uint32_t)(b)[(i)])             \
| ((uint32_t)(b)[(i) + 1] <<  8)             \
| ((uint32_t)(b)[(i) + 2] << 16)             \
| ((uint32_t)(b)[(i) + 3] << 24);            \
}
#endif

#ifndef PUT_UINT32_LE
#define PUT_UINT32_LE(n, b, i)                                    \
{                                                               \
(b)[(i)] = (unsigned char)(((n)) & 0xFF);    \
(b)[(i) + 1] = (unsigned char)(((n) >>  8) & 0xFF);    \
(b)[(i) + 2] = (unsigned char)(((n) >> 16) & 0xFF);    \
(b)[(i) + 3] = (unsigned char)(((n) >> 24) & 0xFF);    \
}
#endif

void mbedtls_md4_init(mbedtls_md4_context *ctx)
{
	memset(ctx, 0, sizeof(mbedtls_md4_context));
}

void mbedtls_md4_free(mbedtls_md4_context *ctx)
{
	if (ctx == NULL) {
		return;
	}

	mbedtls_zeroize(ctx, sizeof(mbedtls_md4_context));
}

void mbedtls_md4_clone(mbedtls_md4_context *dst, const mbedtls_md4_context *src)
{
	*dst = *src;
}

/*
 * MD4 context setup
 */
void mbedtls_md4_starts(mbedtls_md4_context *ctx)
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	ctx->state[0] = 0x67452301;
	ctx->state[1] = 0xEFCDAB89;
	ctx->state[2] = 0x98BADCFE;
	ctx->state[3] = 0x10325476;
}

#if !defined(MBEDTLS_MD4_PROCESS_ALT)
void mbedtls_md4_process(mbedtls_md4_context *ctx, const unsigned char data[64])
{
	uint32_t X[16], A, B, C, D;

	GET_UINT32_LE(X[0], data, 0);
	GET_UINT32_LE(X[1], data, 4);
	GET_UINT32_LE(X[2], data, 8);
	GET_UINT32_LE(X[3], data, 12);
	GET_UINT32_LE(X[4], data, 16);
	GET_UINT32_LE(X[5], data, 20);
	GET_UINT32_LE(X[6], data, 24);
	GET_UINT32_LE(X[7], data, 28);
	GET_UINT32_LE(X[8], data, 32);
	GET_UINT32_LE(X[9], data, 36);
	GET_UINT32_LE(X[10], data, 40);
	GET_UINT32_LE(X[11], data, 44);
	GET_UINT32_LE(X[12], data, 48);
	GET_UINT32_LE(X[13], data, 52);
	GET_UINT32_LE(X[14], data, 56);
	GET_UINT32_LE(X[15], data, 60);

#define S(x, n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];

#define F(x, y, z) ((x & y) | ((~x) & z))
#define P(a, b, c, d, x, s) { a += F(b, c, d) + x; a = S(a, s); }

	P(A, B, C, D, X[0], 3);
	P(D, A, B, C, X[1], 7);
	P(C, D, A, B, X[2], 11);
	P(B, C, D, A, X[3], 19);
	P(A, B, C, D, X[4], 3);
	P(D, A, B, C, X[5], 7);
	P(C, D, A, B, X[6], 11);
	P(B, C, D, A, X[7], 19);
	P(A, B, C, D, X[8], 3);
	P(D, A, B, C, X[9], 7);
	P(C, D, A, B, X[10], 11);
	P(B, C, D, A, X[11], 19);
	P(A, B, C, D, X[12], 3);
	P(D, A, B, C, X[13], 7);
	P(C, D, A, B, X[14], 11);
	P(B, C, D, A, X[15], 19);

#undef P
#undef F

#define F(x, y, z) ((x & y) | (x & z) | (y & z))
#define P(a, b, c, d, x, s) { a += F(b, c, d) + x + 0x5A827999; a = S(a, s); }

	P(A, B, C, D, X[0], 3);
	P(D, A, B, C, X[4], 5);
	P(C, D, A, B, X[8], 9);
	P(B, C, D, A, X[12], 13);
	P(A, B, C, D, X[1], 3);
	P(D, A, B, C, X[5], 5);
	P(C, D, A, B, X[9], 9);
	P(B, C, D, A, X[13], 13);
	P(A, B, C, D, X[2], 3);
	P(D, A, B, C, X[6], 5);
	P(C, D, A, B, X[10], 9);
	P(B, C, D, A, X[14], 13);
	P(A, B, C, D, X[3], 3);
	P(D, A, B, C, X[7], 5);
	P(C, D, A, B, X[11], 9);
	P(B, C, D, A, X[15], 13);

#undef P
#undef F

#define F(x, y, z) (x ^ y ^ z)
#define P(a, b, c, d, x, s) { a += F(b, c, d) + x + 0x6ED9EBA1; a = S(a, s); }

	P(A, B, C, D, X[0], 3);
	P(D, A, B, C, X[8], 9);
	P(C, D, A, B, X[4], 11);
	P(B, C, D, A, X[12], 15);
	P(A, B, C, D, X[2], 3);
	P(D, A, B, C, X[10], 9);
	P(C, D, A, B, X[6], 11);
	P(B, C, D, A, X[14], 15);
	P(A, B, C, D, X[1], 3);
	P(D, A, B, C, X[9], 9);
	P(C, D, A, B, X[5], 11);
	P(B, C, D, A, X[13], 15);
	P(A, B, C, D, X[3], 3);
	P(D, A, B, C, X[11], 9);
	P(C, D, A, B, X[7], 11);
	P(B, C, D, A, X[15], 15);

#undef F
#undef P

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
}
#endif							/* !MBEDTLS_MD4_PROCESS_ALT */

/*
 * MD4 process buffer
 */
void mbedtls_md4_update(mbedtls_md4_context *ctx, const unsigned char *input, size_t ilen)
{
	size_t fill;
	uint32_t left;

	if (ilen == 0) {
		return;
	}

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

	ctx->total[0] += (uint32_t)ilen;
	ctx->total[0] &= 0xFFFFFFFF;

	if (ctx->total[0] < (uint32_t)ilen) {
		ctx->total[1]++;
	}

	if (left && ilen >= fill) {
		memcpy((void *)(ctx->buffer + left), (void *)input, fill);
		mbedtls_md4_process(ctx, ctx->buffer);
		input += fill;
		ilen -= fill;
		left = 0;
	}

	while (ilen >= 64) {
		mbedtls_md4_process(ctx, input);
		input += 64;
		ilen -= 64;
	}

	if (ilen > 0) {
		memcpy((void *)(ctx->buffer + left), (void *)input, ilen);
	}
}

static const unsigned char md4_padding[64] = {
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/*
 * MD4 final digest
 */
void mbedtls_md4_finish(mbedtls_md4_context *ctx, unsigned char output[16])
{
	uint32_t last, padn;
	uint32_t high, low;
	unsigned char msglen[8];

	high = (ctx->total[0] >> 29)
		   | (ctx->total[1] << 3);
	low = (ctx->total[0] << 3);

	PUT_UINT32_LE(low, msglen, 0);
	PUT_UINT32_LE(high, msglen, 4);

	last = ctx->total[0] & 0x3F;
	padn = (last < 56) ? (56 - last) : (120 - last);

	mbedtls_md4_update(ctx, (unsigned char *)md4_padding, padn);
	mbedtls_md4_update(ctx, msglen, 8);

	PUT_UINT32_LE(ctx->state[0], output, 0);
	PUT_UINT32_LE(ctx->state[1], output, 4);
	PUT_UINT32_LE(ctx->state[2], output, 8);
	PUT_UINT32_LE(ctx->state[3], output, 12);
}

#endif							/* !MBEDTLS_MD4_ALT */

/*
 * output = MD4( input buffer )
 */
void mbedtls_md4(const unsigned char *input, size_t ilen, unsigned char output[16])
{
	mbedtls_md4_context ctx;

	mbedtls_md4_init(&ctx);
	mbedtls_md4_starts(&ctx);
	mbedtls_md4_update(&ctx, input, ilen);
	mbedtls_md4_finish(&ctx, output);
	mbedtls_md4_free(&ctx);
}

#if defined(MBEDTLS_SELF_TEST)

/*
 * RFC 1320 test vectors
 */
static const char md4_test_str[7][81] = {
	{""},
	{"a"},
	{"abc"},
	{"message digest"},
	{"abcdefghijklmnopqrstuvwxyz"},
	{"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"},
	{"12345678901234567890123456789012345678901234567890123456789012" "345678901234567890"}
};

static const unsigned char md4_test_sum[7][16] = {
	{
		0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
		0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0
	},
	{
		0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
		0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24
	},
	{
		0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
		0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D
	},
	{
		0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
		0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B
	},
	{
		0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
		0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9
	},
	{
		0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
		0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4
	},
	{
		0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
		0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36
	}
};

/*
 * Checkup routine
 */
int mbedtls_md4_self_test(int verbose)
{
	int i;
	unsigned char md4sum[16];

	for (i = 0; i < 7; i++) {
		if (verbose != 0) {
			mbedtls_printf("  MD4 test #%d: ", i + 1);
		}

		mbedtls_md4((unsigned char *)md4_test_str[i], strlen(md4_test_str[i]), md4sum);

		if (memcmp(md4sum, md4_test_sum[i], 16) != 0) {
			if (verbose != 0) {
				mbedtls_printf("failed\n");
			}

			return (1);
		}

		if (verbose != 0) {
			mbedtls_printf("passed\n");
		}
	}

	if (verbose != 0) {
		mbedtls_printf("\n");
	}

	return (0);
}

#endif							/* MBEDTLS_SELF_TEST */

#endif							/* MBEDTLS_MD4_C */
